To solve the single color problem on cotton fabric by Green Walnut Husk pigment extract, the dyeing process on index of color features and color fastness were optimized combining with single factor design and orthogonal experiment, and four selected factors were mass concentration, pH, dyeing time and temperature. Further more, the influence of the dyeing performance of cotton fabric were compared by the mordant dyeing methods of single metal salt and the double metal salts complex pair. The results showed that the optimal extraction conditions as follows: dyeing temperature 90oC, pH value 4.0, mass concentration 71.40 g/L, dyeing time 140 min. For dyed cotton fabric, a wide spectrum range and excellent friction fastness was observed. As for soaping fastness, single metal salt mordant dyeing of cotton fabric was post-mordanting  pre-mordanting  meta-mordanting  direct dyeing. And the color fastness of double metal-complex salt and single metal salt mordant of Fe3+, Fe2+, Cu2+, Al3+, Cr6+ reached more than level 3. X-ray diffraction analysis showed that the internal structure of cotton fiber was not affected, In addition, the findings indicated that the anti-ultraviolet property of dyed cotton fabric enhenced distinctly by single metal salt mordant of Fe3+, Fe2+, Cr6+, Sr2+, Na+, K+ and double metal-complex salt mordant of Fe2+/Cu2+, Fe2+/Ti4+, Cu2+/Ti4+, Cu2+/Sn2+, Al3+/Cr6+, Cr6+/Ti4+ and Cr6+/Sn2+.